Power control.



E. G. POWER CONTROL. v

APP LIUATION FILED JUNE 1, 1906. W

Patented July 21,1914;

3 SHEETS-SHEBT 1.

E. GFIHOMAS.

POWER. CONTROL.

APPLICATION FILED JUNE 1,1906. v

Patented July 21, 1914.

3 SHEETS-SHEET '2.

i "EH-G. THOMAS. POWER CONTROL APPLIOATION FILED JUHE 1, 1906. I

ratent d Ju1 121, 1914 UNITED STATES PATENT OFFICE. EDWARB G. THOMAS, or osrroiv, MASSACHUSETTS, ASSIGNOR To LAMsoN cor/tr nity, or NEWARK, NEW JERSEY, A con-ronariolv or NEW JERSEY.

POWER CONTROL.

1,104,019. p i n of Letters Patent Patented July 21, 1914;. Application filed June 1, 1906. serial no. 319.731.

To all I(/l(/IH it 7/1 (1 column. 1 in rotational relation to the casing H; oppo- Be it known that I, EDWARD Gr. THOMAS, J site to the connection between the casingH of Boston. in the county of Suifolk and and the storage drum C, the said casing is State of Massachusetts, have invented oer-i connected to a. pipe E which is open to the tain new and useful Improvements in Power atn'iosphe're through the ports E and which Control, of which the following is a specififor reasons which will be given later, extends cation. beyond the ports E to make a similar c0n- My invention relates to improvements in nection on the vacuum side of the apparatus power control especially for apparatus for to that which has been described for the 10 compressing or exhausting air or other fluids pressure side. Mounted on the outer or pro and is intended to provide a new and more jecting end of the shaft H is a crank arm elticient' way of adjusting. the work done by Hiconnectcd with a piston rod F 2 by means the pumping device to the amount of fluid of the link H Fixed to the piston rod 1w required by: the service to be performed. is the piston F reciprocrlly mounted within 15 .It consists of switching devices located the cylinder I. The lower end of the piston on one or both .sides of the pump by which rod. F cxtendsthrough a bearing in the the current of iluid produced by it may be lower head of the cylinder F and carries the delivered to the storage tank of the opcratyoke F to which are attached at one end ing system as long as the pressure therein= the tension springs F said springs being 20 is below a predetermined point and may be attached at the opposite end to the lower delivered to a receptacle containing a less: cylinder head of the cylinder F. The lower 1n'cssuresuch as the atmosphere in the case f portion of the cylinder F is normally open of air--whenever the predetermined presto the atmosphere by holes F 5 (Fig. 2). sure is exceeded inthe storage tank. The pipe C connected at one end with the o The invention is of special value in con-- drum 0 is connected atthe opposite end ncction with pneumatic tube systems where with the upper portion of the cylinder above the air is furnished by a blower driven by the piston F by a passage F controlled by an electric motor. the valve G attached to the diaphragm G My invention provides a nieans whereby which diaphragm is incloscd by the cap G 30 the blower may rotate at a constant speed. mounted iii the head of said cap is the addoing no work beyond that required to overjustablc screw G secured in positio'ii by the come friction except when the reserve prescheck nut G" and connected with the diasure is less than normal. phragm by the spring G Said valve G In the accompanying drawings which normally holds the passage F open, the

35 illustrate a construction embodying my in 7 upper part of the passage F being connected vent-ion, Figure 1 is a side elevation of the with tie atmosphere by a passage F 7 condevice in operating connection with a trolled by a recess G in the valve Gr. This blower and a vacuum and )ressure stora e i assa e is normall closed b the valve G.

drum. I 1g. 2 is an enlarged sectionalele- 'lhe pipe C is connected with the outer 40 vation of the controlling mechanism Sl1OW-. diaphragm chamber G by the pipe G ing the position of the parts when the Controlling the communication of the pipe blower is relieved of load on the pressure I) with the vacuum tank is a similar side. F 1g. 3 is an enlarged sectional elevaswitch and controlling mechanism adapted tion of the controlling mechanism showing to be operated by vacuum and the operation 45 the normal position of the parts with the of which is hereinafter fully described. The

blower in o )eratiii connection with the direction of the air currents is indicated b vacuum storage drum. v arrows.

Like letters of reference refer to like parts X represents connections of outside appatliroughout the several views. ratus (preferably pneumatic despatch tube 0 C and D are respectively a pressure and apparatus) with the pressure drum C and a vacuum storage drum connected to the the vacuum drum D. blower B by the pipes C andeD. In the The ope 'ation is as follows: The blower pipe C is placed a switch or valve H con- 13 driven by the motor A produces air cursisting of a vane H secured to a shaft '11 l rents in the directions indicated by the arrows Fig. 1; this. produces a vacuumjin the drum 'D anda pressure greater than atmospheric in the drum C with thevalves in normal position shown in Figs. 2 and 3; the ;pressure in -the drum O passing through the passage F entering the upper-part, of the, cylinder against the tension of the s rings 1 this pressure also acts through t e pipe G within the diaphragm chamber a position shown 'indotted lines F The cylinder. The springs 'Ft'now force the.

piston upward and through the link'I-I. and

crank H turn the balancevalve H into the check-valve 6, now closesand thecurrent of 1 air is divertedthrough the pipe E and aper tures E' into the "atmosphere. When the pressure in the tank C drops below normal;

the spring Gr causes the diaphragm and? valve G to assume normal position opening the passage Feausif1g the pressure to enter} the cylinder, forcing the'p1stonf'downward and causing the valve H to assume its' norm'al position; The pressure now passes through the pipe C into" the drum C. l

In the mechanism shown in Fig. 3 con-c pipe E, checkvalve C j trolling the vacuum drum D, the piston F g,

is held by the spring F at the lower part= of the cylinder F.

The, vacuum communieating through the pipe D and. passage G with the diaphragm chamber Gf'aets upon the diaphragm G and is normally balanced;

bythe spring G. When the vacuum exceeds the normal, the diaphragm is drawn outward causing the valve G to close the; passage F to the atmosphere and open communication of the vacuum with the cylinder through the passage F. The vacuum nowdraws'the piston F to the upper part' of the cylinder, causing the valve H to assume the position shown in dotted lines and open the blower to the atmosphere. When-. the vacuum decreases releasing the dia-' phragm G the passage F -is closed to the vacuum and opehed to "the atmosphere through passage F by means of the valve G- causing the piston and valve H to as,

sume normal position.

The pipe E is made continuous between.

the pressure and vacuum valves in order that'when both sides of the blower are con-' 1 nected'to the atmosphere the airmay pass I from the pressure side directly to the vacuum side without the loss of power-which will occur if separate openings into the at- :gd ire to secure "by mos'phere are provided. This loss of power comes through the eddies produced by driving the discharged air directly into the atmosphere and re -collecting from the atmosphere the same volume at another point.

Either side of the blower can be relieved of'load independently of the other by the installed, that is to say, either the pressure 1 or the vacuum mechanism may be installed as the. case requires.

"This invention may be applied to any form of pumping machinery and mechanical equivalents may be substituted for any of the parts described;

Having thus described the nature of my invention and set forth a. construction em- 0 ying the same, what I claim as new and i Letters Patent of the U itedistates'isz l 1. In anapparatus of the pressure storage drum communicating with the pressure side er the blower, a. vacuum 1' open to the external air at a point-intermediate of its connections with the drums, and a valve mechanism controlling the commu nications of the-pressure drum with the blower and pipe actuated by fluctuations of pressure in the pressure drum'to direct the pressure from. the blower to-either the pressuredrum' orthe'pipe; 1

2. In an apparatusof the character described, a constantly operating blower, a pressure storage drum communicating with thepressure sideof the blower, a vacuum storage drum communicating with the exhaust side-of the blower, a pipe forming a communication between said drums and open to the external air at a point intermediate of its'connections with the drums, and a valve mechanism controlling the communications of the vacuum drum with the character de scribed, a constantly operating blower, a

blower and pipe actuated'by fluctuations of the vacuum in the vacuum drum to direct the exhaust to the blower from either the vacuum drum or from the pipe.

3. In an apparatus of the character depressure storage drum communicating with scribed, a constantly operating blower, a I

the pressure side of the blowerpa vacuum storage drum communicating'with the ex haust side of the blower, a pipe forming a communication between said drums and open to the external air ata-point inter- LII mediate of its connectionswith the drums, a valve mechanism controlling the'comn'umications of the pressure drum with the blower pump, a plurality of reservoirs, and means for automatically com'iecting; and disconnecting each reservoir to and from the pump in response to the pressure of the fluid in that reservoir alone.

A fluid pressure system, comprising a pump, a plurality ot reservoirs, and automatic means for independently connecting the pump to each reservoir when the fluid pressure in said reservoir departs from its normal value and disconnecting the pump from said reservoir when said pressure att aifi nsadd normal value.

t. A tluid pressure system, comprising a pump a plurality of reservoirs, means governed hy the pressure in each reservoir for connecting said reservoir to the pump whenever said pressure departs from its normal value and disconnecting said reservoir from the pump when said pressure is restored to its normal value.

7. A fluid pressure system, comprising a pump. a plurality oil? reservoirs, means a orerned hy the pre we in. c: :h reservoir for connecting); ,aid reservoir to the pump whenever the pressure therein departs from its normal value and discoxmect-ing said reservoir from the pump when said pressure returns to said normal value, and a motor for driving said pump whenever any reservoir is connected thereto.

8. In a fluid pressure system, an air pump, two reservoirs, a "alve for connecting the intake side oi the pump to one of the reservoirs or to the atu'iosphere, a. valve for connecting the outlet side of the pump tothe other reservoir 01' to the atmosphere, said valves being independent of said pump, and means for automati-ally controlling said valves in response to the pressures in the reservoirs.

9. In a fluid pressure system, an air pump, two reservoirs, a valve for connecting the intake side of the pump to one of the rcscr voirs orto the atmosphere, a valve .t'or connecting the outlet side of the pump to the other reservoir or to the atmosphere, said valves being, independent of said pumps, and tluid pressure responsive devices for auton'iatically controlling said valves respectively in response to the pressures in the two reservoirs respectively.

10. fluid pressure system, comprising a pump, two reservoirs, a device responsive to the pressure in one of said raservoirs [or connecting the intake side of the pump to said reservoir when the pressure in the lat-- ter rises above a predetermined value, and a second device responsive to the pressure in the second reservoir for connecting the outlet side of said pump to said second reservoir when the pressure in the latter falls below a predetermined value, said devices heiue imlependent of said pumps.

in testimony whereof, I have signed my name toythis specification in the presence of two subscribing witnesses, this twenty-six h day of May, A. D. 1906.

ED'WAR-D G. Tl-lOMr'tS.

\Vitnesses 111mm! \ViLcox, F'anninue \V. inanonaun. 

